The gravitational pull of the Sun affects which of the following properties of the planets in our solar system? Chemical composition
O Speed and shape of orbit
O Formation of land features
Number of moons

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

Summarize possible ways in which phases of matter could combine to form a solution.

Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution. calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.